CONTENTS OF VOL. I. 



(FOURTH SERIES.) 



NUMBER I.— JANUARY 1851. 



Page 



Prof. Magnus on the Motion of Fluids. (With a Plate.) 1 



Mr. T. H. Henry on the White Blende of New Jevsej, U.S. . 23 

 Dr. Stenhouse on Sea- Weeds as the sources of Acetic Acid . . 24 



Prof. Challis on the Principles of Hydrodynamics 26 



Dr. Waller on the Development of the Mouth and Tongue of 



the Frog 38 



Mr. J. A. Broun on Electrical Dust Figures observed on Plate 



Glass. (With a Plate.) 43 



Mr. J. J. Sylvester's Explanation of the coincidence of a Theo- 

 rem given by him in the December Number of this Journal, 

 with one stated by Professor Donkin in the June Number 



of the same 44 



Dr. von Feilitzsch on the Physical Distinction of Magnetic and 



Diamagnetic Bodies 46 



Sir R. I. Murchison on the "Vents of Hot Vapour in Tuscany, 

 and their Relations to Ancient Lines of Fracture and Eruption 5 1 



Proceedings of the Royal Society 68 



On the Chemical Composition of the Air, by M. Lewy 75 



On the Chemical Equivalent of Iron, by M. E. Maumene .... 76 

 On the Ferri- and Ferri-Mangani-Tungstic Acids, by M. A. 



Laurent 77 



On Dulcose, by M. A. Laurent 78 



Meteorological Observations for November 1850 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London ; by Mr. Veall at Boston ; by the Rev. W. Dunbar at 

 Applegarth Manse, Dumfries-shire; and by the Rev. C. 

 Clouston at Sandwick Manse, Orkney 80 



NUMBER II.— FEBRUARY. 



Prof. Draper on the Phosphorescence of Bodies 81 



Prof. Potter on the solution of the Problem of Sound, founded on 

 the Atomic constitution of Fluids 101 



